This document discusses attribution theory, which examines how people explain the causes of behaviors. It introduces attribution theory and its two types: personal (internal) attribution, which looks within an individual to explain outcomes, and situational (external) attribution, which looks outside the individual. Some common attribution errors are discussed, including self-serving bias, where people attribute successes to themselves but failures to outside factors, and the fundamental attribution error, where we tend to attribute others' behaviors more to internal causes rather than external ones. The halo effect is described as making broad generalizations about a person based on a single characteristic. In conclusion, the document advocates considering both situational and personal factors rather than making quick judgments.